Since Fgators is pretty straightforward post flop it's probably to just call here. When i get in marginal 3-bet or just call situations i think about a few things.

1. Does the original raiser play better preflop or postflop?
2. Is there a donkey in this hand that i will keep in by calling but lose him by raising?
3. Will this hand be easier to play in a big pot or a small one?